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United States Patent |
6,085,026
|
Hammons
,   et al.
|
July 4, 2000
|
Electrically heated vapor dispensing apparatus
Abstract
An electrically heated apparatus for dispensing fragrancing materials and
other volatile substances to an enclosed volume such as the interior of a
room which includes a base having a base portion which is generally planar
in structure having a top surface, and a bottom surface from which extends
perpendicularly two (or more) suitably dimensioned electrical plugs. The
base portion further includes incorporated within its construction a
heating means which, when the electrical plugs are connected to a suitable
electrical source, said heating means is energized, resulting in the
heating of the base portion. Further, the base portion of the invention
includes a radiator means. The apparatus further includes a volatile
substance container which contains a quantity of a volatile substance such
as a fragrance or perfume, a disinfecting composition, or an insecticide.
The radiator means provides a surprisingly uniform temperature across the
top surface of the base portion.
Inventors:
|
Hammons; Randall Lee (Sussex, NJ);
Patel; Manhar (Saddle Brook, NJ)
|
Assignee:
|
Reckitt Benckiser Inc. (Wayne, NJ)
|
Appl. No.:
|
665856 |
Filed:
|
June 19, 1996 |
Foreign Application Priority Data
Current U.S. Class: |
392/390; 219/544 |
Intern'l Class: |
A61M 016/00; H05B 003/44 |
Field of Search: |
392/386,387,390
219/541,542,543,544
338/22 R,243,248,273,276
|
References Cited
U.S. Patent Documents
2942090 | Jun., 1960 | Diehl | 392/390.
|
3581266 | May., 1971 | Weyenberg | 338/253.
|
4037082 | Jul., 1977 | Tamada et al. | 219/451.
|
4804821 | Feb., 1989 | Glucksman | 392/390.
|
4849606 | Jul., 1989 | Martens, III et al. | 219/271.
|
4853517 | Aug., 1989 | Bowen et al. | 392/390.
|
5213523 | May., 1993 | Hygema et al. | 439/620.
|
5402517 | Mar., 1995 | Gillett et al. | 392/386.
|
5521357 | May., 1996 | Lock et al. | 392/390.
|
5556192 | Sep., 1996 | Wang | 392/390.
|
5574821 | Nov., 1996 | Babasade | 392/392.
|
5647052 | Jul., 1997 | Patel et al. | 392/393.
|
Foreign Patent Documents |
0195967 A2 | Oct., 1986 | EP.
| |
0498278 A1 | Aug., 1992 | EP.
| |
2117639 | Oct., 1983 | GB.
| |
2192337 | Jan., 1988 | GB.
| |
WO 94/15650 A1 | Jul., 1994 | WO.
| |
Primary Examiner: Paik; Sang
Attorney, Agent or Firm: Fish & Richardson P.C.
Claims
What is claimed is:
1. An electrically heated apparatus for dispensing fragrancing materials
and other volatile substances to an enclosed volume comprising:
a base having a base portion which is generally planar in structure having
a top surface, and a bottom surface from which extends perpendicularly two
or more electrical plugs, an electronic resistor device incorporated
within the base portion, the electronic resistor device having two leads,
a first least in electrically conductive contact with a first of the
electrical plugs, and a second lead in electrically conductive contact
with a second of the electrical plugs;
a radiator having a top surface and a bottom surface, the bottom surface
which is layered in registered with the top surface of the base portion;
and,
a container element which contains a quantity of a volatile substance,
layered in register with the top surface of the radiator.
2. The apparatus according to claim 1 wherein the radiator is a metal
plate, foil or film.
3. The apparatus according to claim 1 wherein the volatile substance is in
a liquid form, in a solid, or in a semi-solid, or paste-like form.
4. The apparatus according to claim 1 wherein the container element is a
block of a porous material.
5. The apparatus according to claim 4 wherein the porous material is a
porous polymeric material.
6. The apparatus according to claim 4 wherein the porous material is a
porous ceramic material.
7. The apparatus according to claim 6 wherein the porous ceramic material
is selected from nonmetallic, inorganic materials containing high
proportions of silicon, silicon oxide, or silicates.
8. The apparatus according to claim 6 wherein the porous ceramic material
selected from clays, porcelains, terra cotta, talc, and cements.
9. The apparatus according to claim 1 wherein the container element is a
porous, fibrous material.
10. The apparatus according to claim 1 wherein the container element
includes a volatile substance selected from the group consisting of
fragrances, perfumes, disinfecting compositions, and insecticides.
11. The apparatus according to claim 1 which further includes a shell
adapted to completely confine the container element.
12. The apparatus according to claim 11 wherein the shell includes one or
more passages passing therethrough.
13. The apparatus according to claim 1 wherein the electronic resistor
device is rated from between 0.1 and 2.0 watts, and has a resistance in
the range of from 1 to 100,000 Ohms.
14. The apparatus according to claim 1 wherein the base is formed of a
polymeric material and the electronic resistor device is wholly encased
within the base portion.
15. A process for delivering a volatile substance to an enclosed volume
which comprises the process steps of:
(a) providing an electrically heated apparatus for dispensing fragrancing
materials and other volatile substances to an enclosed volume comprising;
a base having a base portion which is generally planar in structure having
a top surface, and a bottom surface from which extends perpendicularly two
or more electrical plugs, an electronic resistor device incorporated
within the base portion, the electronic resistor device having two leads,
a first least in electrically conductive contact with a first of the
electrical plugs, and a second lead in electrically conductive contact
with a second of the electrical plugs;
a radiator having a top surface and a bottom surface, the bottom surface
which is layered in registered with the top surface of the base portion;
and,
a container element which contains a quantity of a volatile substance,
layered in register with the top surface of the radiator,
(b) connecting the electrical plugs into an electrical wall outlet within
the enclosed volume and thereby heating the electronic resistor device and
volatilizing the fragrancing materials or volatile substance.
Description
The present invention relates to electrically heated vapor dispensing
apparatus of the type commonly used for dispensing fragrancing materials
and other volatile substances to an enclosed volume such as the interior
of a room.
Electrically heated vapor dispensing apparatus of different types are known
to the art. For example, from UK patent application No. 2117639 to
Brookes, therein is described an air freshening device which includes an
electrical plug having a base, a lid, and a heat barrier plate interposed
therebetween. The device further includes an impregnated paper tablet and
vertical air flow passages. The lid further includes a heating element as
well as a light emitting diode indicating operation of the heating
element. In use, the impregnated paper tablet is heated by the heating
element, thus volatilizing the material contained therein, generally a
perfume, which then passes through the vertical air flow passages to the
surrounding ambient environment. A further device is one which is
disclosed in EP Appn. 92101394.2 to Lempidakis wherein is also provided an
electrically heated air freshening device having means for controlling
natural airflow through the device and thereby release of a volatile
substance.
Therein is also described in U.S. Pat. No. 5,402,517 to Gillett an
apparatus for emitting a volatile chemical agent, with means for adjusting
the heating of a volatilizable material.
There is also known a tamper resistant container for use in conjunction
with an electrically heated vapor dispensing apparatus from U.S. Pat. No.
4,849,606 to Martens III. The Martens' device includes a tamper resistant
package which includes a container having a free-standing rib extending
from the bottom in an upward direction. The open side of the container is
covered with a vapor permeable membrane, and the container itself contains
a quantity of a fragrance material in a carrier gel. The technical
advantage of such container is recited as a reduced propensity for the
damage of the membrane during the handling and insertion of said container
into an electrically heated vapor dispensing apparatus which is
dimensioned for receiving the container.
While these recited apparatus are useful, they are not without their
disadvantages, a major disadvantage being in that they are either
complicated in their construction and consequently are labor intensive in
their manufacture and/or are expensive in their design and consequently
are not particularly suited to be used as single-use, i.e., disposable
devices. These and other shortcomings present in prior art devices also
evidence the real and continuing need for improvements to electrically
heated vapor dispensing apparatus. These and other shortcomings present in
prior art devices have prompted the inventors to produce the present
invention.
Accordingly, it is an object of the invention to provide an electrically
heated vapor dispensing apparatus which is relatively simple in its
construction, is effective in dispensing an amount of a volatile substance
to an ambient environment such as the interior of a room, and due to its
economic materials and method of construction, may be disposed of after
one use.
It is a further object of the invention to provide an improved electrically
heated vapor dispensing apparatus which may be used a plurality of times
in conjunction with a replaceable volatile substance in a suitable
container.
It is a yet further object of the invention to provide an improved method
for the manufacture of an electrically heated vapor dispensing apparatus.
It is a still further object of the invention to provide a method for
dispensing a volatile substance to an ambient environment such as a closed
room or any other closed space which comprises the step of: providing an
electrically heated vapor dispensing apparatus as described herein which
is in electrical connection with a suitable power source.
These and other objects of the invention are satisfied by the present
invention which is described in more detail below.
FIG. 1 shows a perspective view of a base portion of an electrically heated
vapor dispensing apparatus according to the present invention;
FIG. 2 depicts a top view of the base portion of FIG. 1;
FIG. 3 illustrates a side view of the base portion of FIG. 1;
FIG. 4 illustrates a cut-away side view of the base portion according to
FIG. 1 along reference line a--a, as well as according to FIG. 3;
FIG. 5 illustrates a portion of the preferred heating means according to
the present invention;
FIG. 6 illustrates an exploded perspective view of an electrically heated
vapor dispensing apparatus according to a first preferred embodiment of
the invention;
FIG. 7 illustrates an exploded perspective view of an electrically heated
vapor dispensing apparatus according to a second preferred embodiment of
the invention;
FIG. 8 illustrates an exploded perspective view of an electrically heated
vapor dispensing apparatus according to a third preferred embodiment of
the invention;
FIG. 9 illustrates an exploded perspective view of an electrically heated
vapor dispensing apparatus according to a fourth preferred embodiment of
the invention;
FIG. 10 illustrates an exploded perspective view of an electrically heated
vapor dispensing apparatus according to a fifth preferred embodiment of
the invention;
FIG. 11 illustrates an exploded perspective view of an electrically heated
vapor dispensing apparatus according to a sixth preferred embodiment of
the invention; and
FIG. 12 illustrates an exploded perspective view of an electrically heated
vapor dispensing apparatus according to a seventh preferred embodiment of
the invention.
The electrically heated vapor dispensing apparatus according to the
invention includes a base portion which is generally planar in structure
having a top surface, and a bottom surface from which extends
perpendicularly two (or more) suitably dimensioned electrical plugs. The
base portion further includes incorporated within its construction a
heating means which, when the electrical plugs are connected to a suitable
electrical source, said heating means is energized, resulting in the
heating of the base portion. Further, the base portion of the invention
includes a radiator means which is in physical contact with the top
surface of the base portion and preferably is coincident with
substantially the entire top surface of the base portion such that the
radiator means is a thin sheet or film layered and registered in
contacting the top surface.
Turning now to FIG. 1, there is depicted a base portion (10) according to a
preferred embodiment of the present invention. The base portion includes a
base (12) which has a top surface (not shown) which is substantially
completely covered by the radiator means (14) which is layered in register
and in physical contact therewith. The base portion further includes
electrical plugs (16) which in the present and following figures
illustrating the invention, are two spade type plugs which are in
conventional use in North America. It is to be understood however that
other configurations for suitable electrical plugs may be used for example
those of circular cross section such as are in present use in Europe,
three spade type plugs having the configuration in conventional use in the
United Kingdom, as well as spade type plugs at a tilted or slanted angle
as is in conventional use in Australia. The precise dimensions and
configuration of these electrical plugs are not critical, but need only
correspond to the dimensions required for the electrical wall receptacles
into which the electrical vapor dispensing apparatus is intended to be
connected to a suitable power source. Thus, by variation of these
electrical plugs (16), the apparatus according to the present invention,
may be readily adapted to be used virtually anywhere in the world.
With regard to the radiator means (14), said means is a heat conducting
material and is preferably a thin plate, sheet, film, or tape which may be
readily affixed to the top surface of the base portion and to
substantially cover (which is to be understood as most, i.e., in excess of
75% of the of the area) of the top surface. Most desirably, the radiator
means is a thin metal or metallic film or foil having a thickness of
between about 0.01 to about 2 millimeters, and more preferably from about
0.1-1 millimeter. Such a plate, sheet, film, or tape may simply layered or
stacked on top of the top surface of the base (12). Desirably, such a
plate, sheet, film, or tape is directly applied to the top surface of the
base (12) with the aid of a suitable adhesive material interposed between
the radiator means (14) and the top surface of the base (12). Such an
adhesive material is desirably present in an amount which is sufficient to
provide proper adhesion between the top surface of the base and the
radiator means. Further, desirably such an adhesive layer is not so thick
as to substantially reduce the transfer of heat from the base to the
radiator means. Desirably, the radiator means is a metallic plate, sheet,
film or tape such one formed from on including iron, gold, silver, lead,
chromium, aluminum, nickel, copper of virtually any other heat conducting
metal including alloys which includes of one or more of the above such as
brass, bronze, tin and zinc, as well as ferrous alloys, stainless steel,
aluminum alloys and the like. Most desirably the radiator means (14) is
tape or film having an adhesive deposited on one side which is then
readily adherable to the top surface of the base (12).
Alternatively, the radiator means (14) may be a metallic material or a
material which contains metallic particles other than those recited above
which are applied to the top surface of the base (12). For example,
radiator means (14) may be directly deposited by vapor deposition
techniques, or may be a metallic material or metallic particle containing
material which is applied by sputter-coating techniques, as well as
mteallic particles contained within a coating composition which may be
directly laid on the top surface, such as be screen printing techniques.
In such a method, the coating composition may require subsequent drying or
curing of said composition prior to the use of the apparatus according to
the invention.
Turning now to FIG. 3, therein is depicted a side view of the base portion
(10) according to FIG. 1. As is therein illustrated, the radiator means
(14) is layered in register with the top surface (not shown) of the base
(12). The base portion (10) further includes two electrical plugs (16)
which extend perpendicularly from post portion (18) of the base (12) and a
portion of each of the plugs (16) is are embedded within said post portion
(18). It is to be understood that the post portion (18) depicted is an
integral part of the base (12) and if the base (12) is of a sufficiently
thick dimension to contain the heating means and provide a support for the
plugs (160, the post portion (18) may be omitted from the construction of
the base (12).
With reference now to FIG. 4, therein is shown a cross-sectional view taken
along line "a--a" of FIG. 1., as well as being similar to that depicted in
FIG. 3. Illustrated in this cross-sectional view is a heating means (20)
in electrical communication with each of the electrical plugs (16). The
heating means (20) may be any electrical resistance device which, when
connected to the power source such as available in a wall outlet, causes
the generation of heat which is then dissipated into the base (12). A wide
variety of known electrical devices may be used and generally any which
includes a resistance element such as a bulb filament, a wire segment such
as as of nichrome wire, but is most desirably an electrical resistor
device as is commonly known in the electronic arts. It is required only
that the heating means provide sufficient heat such that when dissipated
into the base portion causes the volatilization of the volatile substance
as will be described in more detail hereafter.
Turning now to FIG. 5, there is illustrated a side view of two plugs (16)
and the preferred embodiment of the heating means (20), viz., an
electrical resistor. With regard to the selection of the resistor, any
which generates an appropriate amount of heat to induce the volatilization
of the volatile material in the apparatus according to the present
invention may be used, while at the same time does not undesirably soften
or melt the material of which the base portion is formed. It is to be
understood that the actual selection of such a suitable electrical
resistor is in part dependent upon the power source to which it is to be
attached, as well as on the characteristics of the vaporizable material
with which it is to be used. By way of non-limiting example, for use with
a 120 v, 50/60 cycle alternating circuit power source (such as in common
use in North America) an electrical resistor especially an electronic
resistor device rated from between 0.1 and 2 watts, and having a
resistance in the range of from 1 to 100,000 ohms is generally appropriate
for use. A specific preferred embodiment is described in the Example,
below. The electrical resistor namely, an electronic resistor device
includes two resistor leads, i.e., wires which extend from the resistor,
and one of each wires (22) is in electrically conductive contact with a
plug (16). While not illustrated in particular detail, it will be
understood that any means for effecting such an electrically conductive
contact may including but not limited to: a crimped or soldered connection
between the wires (22) and the plugs (16) as well as wrapping or otherwise
contacting a portion of the wires (22) with the plugs (16).
With regard to the base (12) as well as its integral post portion (18) (if
present), such is desirably formed from a thermoplastic or thermosetting
polymeric material which has sufficient heat tolerance such that it is not
undesirably softened or melted when the heating means incorported within
is energized during normal use of the appratus. Such may be any of a
variety of known materials which by way of example include polymers and/or
copolymer resin compositions based on: nylons, polyethylene terephthalate,
polybutylene terephthalate, polyolefins, styrenes, polyacetal resins,
polysulfones, as well as others which exhibit such desired heat tolerance
properties as denoted above. Such mateirials may be blends of one or more
such polymers and/or copolymers, as well as commerically available
polymeric compositions which may include additives or modifiers such as
fillers including talc, comminuted carbons such as carbon black, glass
fibers, glass beads, any of a variety of fire retardant materials, as well
as colorants, pacifiers, pigments, and the like. The inclusion of one or
more conventional additives to the polymer may be desired to adjust the
properties thereof, such as to impart desirable physical properties such
as stiffness, and/or heat transfer characteristics of the polymer
material. Of such polymer and/or copolymer resin compositions,
thermoplastic resins which may be used in an injection molding process are
desirably used. An advantage of the use of such an injectable polymeric
material is that in the manufacture of the base portion, the heating means
and the plugs may be first preassembled, subsequently inserted into a
suitable die cavity, and afterwards a quantity of the injectable polymer
resin may be introduced into the die cavity to form the base in a single
manufacturing step. In such a step, the plugs (16) may be positioned
within the base (12), and at the same time the polymer resin composition
envelops the heating means at all sides. Thereafter, the radiator means
(14) may be applied in register with the top surface of the base (12) in
order to form the base portion (10) according to the electrically heated
dispensing apparatus within the scope of the present invention.
A specific and surprising technical advantage of the construction of the
base portion (10) according to the present invention includes the
excellent and uniform heat distribution characteristics which are
provided. With reference now to FIG. 2, therein is illustrated a top view
of the base portion (10) according to FIG. 1. The top surface includes a
radiator means and further depicted on FIG. 2 are further reference
characters which indicate particular regions of the radiator means. More
particularly, in FIG. 2, "A1" represents the region of a first corner, "A2
the region of a second corner, "A3" the region of a third corner, and "A4"
the region of a fourth corner of the radiator means (14). Further, the
letter "C" indicates the central region of the same radiator means (14).
The present inventors have surprisingly found that when a base portion
according to FIG. 1 was constructed, but without the use of a radiator
means, that a wide and disparate variation in the temperatures observed at
each of these indicated regions occurred. These results are illustrated on
Table I below. The inventors have also surprisingly observed that a
significant improvement in the temperature characteristics are provided by
the base portion (10) according to the present invention than might be
expected. Surprisingly, the present inventors have found that not only was
the differential in temperature between the central region C and any of
the corner regions A1, A2, A3 or A4 of the radiator means no more than a
few degrees in temperature (celsius), which provided that the temperature
gradient across the surface of the radiator means (14) was low, and was
almost level as compared to the base portion without the radiator means
(14). Further surprisingly, as compared to a similar base portion without
the heat radiator means, the temperature of the central region C was
significantly higher than when the radiator means (14) was included in the
construction of the base portion (10). Such observations are more fully
described in conjunction with the Example below. Generally, any of the
corner regions were within 5.degree. C. of the central region, and are
more desirably within 3.degree. C. of the central region of the radiator
means (14) of the base portion (10) according to the invention.
Turning now to FIG. 6 there is illustrated in an exploded view the elements
which comprise a first preferred embodiment of an electrically heated
vapor dispensing apparatus (60) according to the present invention.
Therein is provided a base portion generally indicated as (10), which
includes a base (12) having extending perpendicularly from a bottom
surface thereof two plugs (16). On the opposite surface, the top surface,
is a radiator means (14) layered in register with the top surface (not
shown) of the base (12). Next (intended to be layered in register) is a
volatile substance container (62) which contains a quantity of a volatile
substance such as a fragrance or perfume, a disinfecting composition, or
an insecticide. The next element which is included in this preferred
embodiment is a shell generally referenced as (70), said shell (70)
including a top wall (72) have a plurality of openings (74) passing
therethrough. The shell (70) also includes two opposite side walls (76)
and (78) (not shown) which have extending downwardly beyond their
corresponding bottom edges (77), (79) a snap lock tab (80) which is
suitably dimensioned to be engaged with at least a portion of the base
(12) of the base portion (10) when the apparatus is assembled. The shell
(70) is hollow in its interior and is suitably dimensioned to accommodate
and completely confine the volatile substance container (62) within its
interior when the shell (70) is affixed to the base (10). In this figure,
the volatile substance container (62) is in the form of a porous container
(63) which includes within a quantity of a vaporizable material as will be
described in more detail below.
While optional, it may be further desired to include a cover film (90)
which cover film may be any vapor impermeable or poorly vapor permeable
material. The cover film itself may include an adhesive on one side
thereof which is intended to cover and seal all of the openings (74) which
may be when present in the shell (70). The cover film (90) itself may
include a graspable portion thereof such as extended tab (92) illustrated
on FIG. 6. The presence of such a tab, although not necessary, greatly
facilitates the ability of an individual to grasp the cover film and
remove it from the top wall (72) of the shell prior to the insertion of
the apparatus into a wall outlet. While such a cover film is optional the
inclusion of such a cover film is especially advantageous. The use of such
a cover film (90) slows or halts the volatilization of the volatile
substance from the interior of the apparatus and maintains the same in a
ready-to-use condition for the ultimate consumer. The consumer of the
product then needs only remove the cover film (90) and subsequently insert
the plugs (16) into a suitable wall outlet which acts to connect them to a
suitable power source.
With regard to the volatile substance (62) as illustrated in FIG. 6,
therein is depicted one embodiment of such container which is in the form
of a block (63) of a porous material. Preferably, such a porous material
is a porous polymeric material such as a sintered polymer material which
may be immersed, doused, or otherwise supplied with a quantity of a
volatile substance such as a fragrance or perfume, disinfecting
composition or insecticide which is entrained therein and when the porous
material is heated to the temperatures provided by the base portion (10)
of the apparatus according to the invention, induces the volatilization of
the said volatile substance. Further preferably the porous material may be
a porous ceramic material which may be any of a large class of
nonmetallic, inorganic materials containing high proportions (i.e., at
least 75% wt.) of silicon, silicon oxide, silicates as well as other
materials not particularly elucidated here, and which have a porous
structure which acts to absorb or entrain the volatile substance used.
These include clays, porcelains, terra cotta, talc, cements as well as
other ceramic materials which are known to the art which feature a porous
structure. Such may be formed into a suitably dimensioned configuration,
such as is described herein using conventional casting or molding
techniques. It is further contemplated that none, all or part of the
surface of such a block (63) constructed of a ceramic material may be
glazed, coated or at least partially encased in an impermeable container.
It is yet a further embodiment a fibrous material which is porous and which
may be used to entrain quantity of the volatile substance as described
above may also be used as the volatile substance container (62) as
depicted in FIG. 6. Non-limiting examples of such fibrous material may be
of any construction, such as a block, pad or sponge of compressed, woven
or non-woven fibrous material which may be inserted into the electrically
heated vapor dispensing apparatus as described in FIG. 6. Exemplary
fibrous materials include naturally occurring or synthetic fibrous
materials as well as blends of two or more such fibrous materials.
Advantageously, those based on naturally occurring or regenerated
cellulose fibers in the form of compressed blocks may be utilized, with
compressed sheet-like constructions especially to be preferred. Absorbent
celluslose comprising paper pads or sheets are particularly advantageously
used. Such cellulosic construction is desirably utilized as it is
excellent in entraining a quantity of the volatile substance, may be
easily and cheaply produced, and has little likelihood of ignition or
charring when heated to an appropriate volatilization temperature.
Turning now to FIG. 7 there is illustrated a second preferred embodiment of
the electrically heated vapor dispensing apparatus (60) according to the
present invention. The present apparatus is similar in most respects to
the apparatus illustrated on FIG. 6 and corresponding elements are
corespondingly numbered. In this second embodiment, the construction of
the volatile substance container (62) differs from that previously
described in FIG. 6. According to FIG. 7, the volatile substance container
(62) comprises a container element (94) which has contained therein a
quantity of a volatile substance composition (96), which may be in a
liquid form, or in a solid, or semi-solid form such as a gell or
paste-like form. The container element in (94) may be any housing of a
configuration which is suited for the retention of the volatile substance
composition (96) contained therein, is constructed of a material which is
impermeable or only poorly permeable to said volatile substance
composition (96) contained within, and which is suitably dimensioned to
fit between the top surface of the base portion (10) and within the
interior of the shell (70). Any variety of materials may be used in the
construction of this container element (94) including, but not limited to,
polymeric materials, metallic materials, as well as those formed from
paper constructions such as paper coated on one or more surfaces with a
material which resists the permeation of the volatile substance into the
paper.
Turning now to the volatile substance composition (96) such may be solid,
or semi-solid form such as a gel or paste-like form. By way of
non-limiting example such compostions include a gelling agent which may be
any of those known to the art such as fumed silica, DBS, carageenan as
well as others not denoted here. The advantage of the utilization of such
a volatile substance composition (96) is that generally, compared to other
forms, such a composition provides ability to include therein a high
proportion of the volatile substance intended to be delivered by the
apparatus with respect to its base or carrier component. The volatile
substance composition (96) may also be a porous substrate such as the
porous ceramic or porous polymer material described in cojunction with the
block (63) which contains a quantity of a volatile substance.
Desirably although not illustrated in FIG. 7, it is to be clearly
understood that a single or bi-layered or multi-layered film (97) may be
provided to cover the volatile substance composition (96) within the
volatile substance container (62). Such a film may be a single layer film,
such as a vapor permeable membrane. Alternatively a single layer film
which is vapor impermeable may be used, such as a film of a polymer
exhibiting good vapor barrier properties or a metal film or foil. In such
an embodiment, the vapor impermeable film is removed such as by peeling
off from the volatile substance container (62) prior to the use of the
apparatus. In a further alternative, the film may be a bi-layered or
multilayered film which includes a vapor permeable membrane layer, and a
vapor impermeable membrane layer. In such a construction, the vapor
permeable membrane layer is layered between the volatile substance
composition (96) and the vapor impermeable layer, and in use, desirably
the vapor impermeable layer is removed such as by peeling off said layer
and may be discarded. The vapor permeable membrane layer is retained as
part of the volatile substance container (62) and covers the volatile
substance composition (96) which may then be used in the apparatus
according to the invention. Such single layer, bi-layer and multilayer
films are known to the art and include those formed from polyolefins
including for example polyethylene and polypropylene especially low
density grades of such polyolefins; copolymers such as ethylvinylacetate
copolymers, as well as other commercially available membrane materials
including Teslin, silicone coated paper as well as Tyvek (DuPont,
Wilmington Del.) may be useful as vapor permeable membrane, single layer,
bi-layer and multilayer films are known to the art which are useful as
vapor impermeable films include virtually any known to the art such as
metal foils, polymeric films having a sufficiently high barrier property
to the volatile material such as fluoropolymer contiaining films and PVDC.
Methods for affixing such films to the volatile substance being suitably
affixed such as by heat sealing, gluing, or other affixing via appropriate
means to the container element (94). This may be facilitated by including
a flange (95) which extends along the periphery of the container element
(94). In this manner, when a vapor permeable membrane is provided such
permits the volatile substance to pass from the container element (94) yet
denying the passage of the volatile substance composition (96) contained
therein to phycially flow out or fall out. Where there is provided a
single or multi-layer, especially a bi-layered film having a vapor
impermeable layer such as a metal foil or vapor impermeable polymer film,
such a construction is particulary advantageous for use where the
apparatus of the invention may be used a plurality of times. In such case,
the volatile substance container (62) may be provided as a refill
cartridge to a consumer, who need only remove the vapor impermable layer
prior to inserting the volatile substance container (62) in contact with
the base portion (10) of the apparatus according to the invention.
Turning now to FIG. 8 there is illustrated in perspective view the elements
which may be used to construct a third preferred embodiment of the
electrically heated vapor dispensing apparatus according to the invention,
again generally indicated as (60). Therein as depicted, is included a base
portion generally referred to as (10) which includes a base (12) having
perpendicularly extending downwardly from bottom face thereof two plugs
(16). The base portion further includes a top face (98) which has
extending perpendicularly therefrom four walls (100), (102), (104), (106)
which are generally rectangular in configuration and which are joined at
corners, the said four walls defining a generally square enclosure (108)
which extends from the top surface (98) of the base (12). Within the
enclosure (108) and at top surface the base (12) thereof, is located the
radiator means (14) here here illustrated as a metal foil which is adhered
to the top surface within the confines of the enclosure. It is also to be
noted that the dimensions of the walls are such that a marginal recess
(112), (114) as well as (116), (118) (not visible), is present between the
corresponding outermost edge of the base portion with the corresponding
wall (100), (106) and although not visible shown in FIG. 8, such a recess
exists at the base of each of the further walls (102), (104).
Further illustrated in FIG. 8 is an shell (70) having side walls (76),
(78), (124) and (128) as well as a top wall (72). The top wall includes a
plurality of openings (74) passing therethrough which are configured in
the form of a decorative "flower petal" pattern which defines open
passages between the interior of the shell (120) and the exterior, i.e.,
the ambient environment within which the electrically heated vapor
dispensing apparatus is to be used. The shell (70) itself is dimensioned
such that it may be slidably fitted upon the base portion (10) whereby the
side walls (76), (124), (78) and (128) encase the walls (100), (106),
(104) and (102) extending from the top surface (98) of the base (12).
Desirably, these side walls (76), (124), (78) and (128) preferably rest in
the recesses (112), (114), (116) and (118) (the latter of the two which
are not shown). In this manner, either of the volatile substance
containers (62) depicted and which have been described previously may be
disposed within the enclosure (108) of the base portion (10) may be
encased by the shell (70). Such volatile substance containers (62) may be
either of the types as have been discussed with reference to FIG. 6 and
FIG. 7.
The shell (70) and the base portion (10) may be interconnected by any
suitable means, i.e., chemical means such as by disposing an adhesive
material between portion of the shell (70) and the base portion (10)
especially such as at the position of one or more of the recesses (112),
(114), (116) and (118) of the base (10); by mechanical means such as by
friction fitting, or as by providing snap-fitting elements such as
described previously; or, by welding or melting, a portion of the shell
(70) to bond it to the base portion (10).
Further, as has been noted previously, as it is contemplated that such an
assembled electrically heated vapor dispensing apparatus (60) as is
depicted in FIG. 8 may be expected to have a shelf life between its
fabrication and the time of its use, such apparatus may also be provided
with a cover film (90) which optionally includes a graspable tab (92) as
has been discussed with reference to FIG. 6 and/or FIG. 7.
Turning now to FIG. 9 there is yet a further preferred embodiment of an
electrically heated vapor dispensing apparatus (60) according to the
present invention, in a partially assembled form. The apparatus according
to the depicted embodiment is designed to be used a multiplicity of times
as opposed to those more appropriate for a single use as disclosed and
described in FIG. 1 through FIG. 8.
With regard to FIG. 9 therein depicted is a base portion (10) having a base
(12) further including plugs (16) extending perpendicularly downwardly
therefrom from a bottom surface, as well as a radiator means (14) disposed
on the top surface (not shown) of the base (12). In this embodiment, the
radiator means (14) is an aluminum foil tape or film which is adhered
directly to the said top surface.
Further as shown, the shell (70) is mechanically engaged and "locked" to
the base portion (10) by means of snap locking tabs (80), (81) (not shown)
which grasps opposite edges of the base (10) and thereby engages and
retains the shell (70) to the base portion (10).
The shell (70) includes at least one end wall (124) which includes an
opening (154) therethrough to the interior of the shell (70) and such
opening (154) is desirably a generally rectangular shaped opening (154)
which is of sufficient size and suitably dimensioned to permit the
insertion of either form of volatile substance container (62) as depicted
and has been described in more detail with reference to earlier figures.
Optionally such a volatile substance container (62) further includes a
single or bi-layered or multi-layered film (97) which has also been
previously described. Additionally, while not shown, the end wall (156)
opposite to that of the end wall (124) having the opening therein (154)
may be either solid, or may include a further opening therethrough to the
interior of the shell (70). The embodiment according to FIG. 9 may also
further include a cover film (90) which further includes a grasping tab
portion (92) to facilitate its removal from the top wall (150) of the
shell.
FIG. 9 illustrates a fourth particularly preferred embodiment of the
electrically heated vapor dispensing apparatus according to the invention
which is designed to be used a plurality of times. Namely, such an
embodiment anticipates that once the volatile substance is dispensed from
the volatile substance container (62) and that once emitted to a
surrounding environment, the volatile substance container (62) may be
readily removed and disposed of. Thereafter, the a further volatile
substance container (62), of either type shown in FIG. 9 may be introduced
into the apparatus (60) and the apparatus (60) thus reused. In such a
manner, a yet further economy attendant upon the use of the apparatus
according to the invention is possible, while retaining the beneficial
volatile substance delivery characteristics as has been described
previously in conjunction with the embodiments of FIG. 6-FIG. 8.
Turning now to FIG. 10 therein is disclosed a fifth preferred embodiment
(60) according to the present invention which is one which may be used
once or which may be used a plurality of times. The apparatus generally
indicated as (60) includes a base portion (10) having a base (12) having
two downwardly perpendicularly extending plugs (16) from a bottom surface,
and a radiator means (14) disposed theron and covering substantially all
of the top surface (not shown) of the base portion. Further extending
upwardly substantially perpendicularly from the top surface of the base
portion are two parallel walls (162), (164). The walls are positioned
slightly inwardly from the corresponding edges (166), (168) of the base
(12) so to define recesses (170), (172) between the base of each wall and
their corresponding edge. Although not depicted in the figure, it is to be
understood, however, that the walls (162), (164) may rise perpendicularly
upwardly from the and be coincident with the edges (166), (168) of the
base (12) in which case no such recesses (170), (172) would be present.
Optionally, but in certain cases desirably, on the interior face of each
of the walls (162), (164) is a longitudinally extending rib (174), (176)
(not shown) which partially, or substantially along the complete width of
the corresponding wall and parallel to the top surface of the base (12)
and extends inwardly towards the opposite facing parallel wall. The
function of these optional longitudinal ribs is to engage portions of a
volatile container (62)which is intended to be inserted between the
parallel walls (160), (162) when the apparatus (60) is used.
The apparatus (60) further includes a shell (70) having at least two side
walls (76), (78) which are parallel to one another, and each of which are
contiguous to opposite edges of the top wall (72). The top wall (78)
further includes a plurality of passages (74) may be included passing
through the top wall (72) of the shell (70). Such passages provide means
for the volatilized volatile substance to escape into the ambient
environment, although it is to be appreciated that the volatilized
volatile substance may also escape at either of the open ends (190), (192)
of the shell (70).
The electrically heated vapor dispensing apparatus according to the
embodiment illustrated in FIG. 10 is formed by the combination of the
shell (70) which is affixed to the base portion (10) in such a manner that
the corresponding walls (76), (78) of the shell (70) are affixed to
encompass corresponding parallel walls (164), (162) respectively of the
base portion (10). Such affixing to one another by mechanical or chemical
means as has been described above with reference to the embodiments
discussed in the prior figures. Thereafter, either volatile substance
container (62) depicted and also described previously is inserted into the
interior of the apparatus (60) between the parallel walls (164), (162)
where the longitudinal ribs (174), (176) when present, may facilitate
their retention within the apparatus (60).
According to FIG. 10, a specific embodiment of an electrically heated vapor
dispensing apparatus having a "slideway" is provided, wherein such an
apparatus construction features a repeated use of the said apparatus prior
to its disposal.
Turning now to FIG. 11 therein is illustrated in an exploded view the
elements of a sixth preferred embodiment of the electrically heated vapor
dispensing apparatus (60) according to the invention which does not
include a shell.
As is shown on FIG. 11, the apparatus (60) includes a base portion (10)
having a base (12) which includes plugs (16) extending perpendicularly
from a bottom surface therefrom and radiator means (14) disposed on the
face of the top surface. Further extending perpendicularly from the second
face therefrom are two spaced apart walls (196), (198), each of which has
a flange portion (200), (202) which desirably extends in the direction of
the opposite wall, and most desirably is perpendicular to the wall from
from which the flange extends. Further desirably, the each flange portion
(200), (202) extends perpendicularly from the edge of the wall (196),
(198) which is distal from the base (12), which is at a height above the
base (12).
The electrically heated vapor dispensing apparatus according to this sixth
preferred embodiment, may be assembled by inserting either of the volatile
substance containers (62) as depicted on the figure, both of which have
been described in detail previously. Either of these two elements may be
slidably inserted and disposed between the radiator means (14), the walls
(196), (198) and at least a portion of the respective flanges (200),
(202). Such a slidably fittable assemblage may be readily produced with
good tolerances of the respective corresponding elements.
FIG. 12 illustrates a seventh preferred embodiment of the electrically
heated vapor dispensing apparatus (240) according to the present
invention.
Turning now with attention to the apparatus (60) depicted on FIG. 12, such
an apparatus comprises the base portion (10) which includes the base (12)
having perpendicularly extending plugs (16) extending from a bottom
surface and a top surface upon which is disposed a radiator means (14).
With specific attention to the embodiment illustrated on FIG. 12 it is to
be noted that the radiator means (14) is in the form of a rigid metallic
plate which is not necessarily adhered to the top surface (not shown) of
the base (12), but rather includes recessed portions (204), (206) which
are dimensioned to be fitted between the base portions (208), (210) of two
upwardly extending side clip walls (212), (214) which extend from the base
(12) in a generally perpendicular upwardly from the base (12). The distal
ends of each of the side clip walls (212), (214) include integrally molded
snap fit locking means (216), (218) which are suitably dimensioned to
ultimately retain a correspondingy dimensioned volatile substance
container (62) which may be inserted between the side clip walls (212),
(214).
The apparatus (60) further includes a volatile substance container (62)
which herein is depicted as a porous ceramic element or a porous polymeric
element (63) containing a quantity of a volatile substance entrained
within. The volatile substance container (62) is dimensioned to desirably
include corresponding recesses (218), (220) which are dimensioned to
permit the passage of the side clip walls (212), (214).
Alternatively, the apparatus (60) further includes a volatile substance
container (62) which is herein depicted as a container element (94) which
has contained therein a quantity of a volatile substance composition (96),
which may be in a liquid form, or in a solid, or semi-solid form such as a
gell or paste-like form. Such has been described previously, particularly
in conduction with FIG. 7. This volatile substance container (62) is
dimensioned to desirably include corresponding recesses (240), (242)
within the flange (95) which are dimensioned to permit the passage of the
side clip walls (212), (214).
The electrically heated vapor dispensing apparatus (60) according to the
seventh preferred embodiment is readily produced by merely physically
inserting the volatile substance container (62) between the side clip
walls (212), (214) until the container (62) is fully seated therein, and
thereby permitting the snap lock elements (250), (252) to engage and to
retain the volatile substance container (62) in a "locked" position. Such
an arrangement also insures that the radiator means (14) is retained in
the position intermediate and in physical contact with the base (12) and
the volatile substance container (62). Advantageously, the volatile
substance container (62) includes recesses (218), (220) which facilitate
assembling the apparatus (60).
Although the embodiment of the apparatus (60) according to FIG. 12 is most
useful as a single-use device, i.e., as disposal after the volatile
substance is volatilized from within the volatile substance container
(62), it is anticipated that the said container may be removed by
disengaging the snap lock elements (250), (252), removing the volatile
substance container (62) and replacing it with a further container having
a quantity of volatile substance therein.
It is also to be understood that a raised or embossed, as well as a printed
decorative design (230) may be included as part of the volatile substance
container (62) so to improve the attractiveness thereof.
It is to be understood that the volatile substances which may be dispensed
utilizing the apparatus described herein specifically includes insect
repellent compositions, deodorizing compositions, medicinal compounds,
herbal compositions as well as disinfectant compositions Especially
preferred as volatilizable materials are those which emanate a fragrance
or scent when volatilized, and are generally scented oils or perfumes
which may be a pure essence oil or which may be a mixture of constituents
such as a minor amount of a perfume or pure essence oil diluted in a
greater volume of a volatile liquid base such as an alcohol. Many such
materials are known to the art, and although not specifically described
here, may be used and are to be particularly considered within the scope
of the present invention.
As will be realized by a reading of the foregoing specification, the
electrically heated vapor dispensing apparatus according to the present
invention provides substantial contribution to the art in providing an
apparatus which is inexpensive to make, may be economically disposed of,
even after one use, but may also be reused a plurality of times and which
due to its elegant and simple design, is reliable in its operation.
Further, the apparatus according to the present invention has overcome
many of the inherent shortcomings in the art, namely the effective
distribution of heat and in the reliable, long-term, uniform
volatilization of a volatile substance which is contained within such an
apparatus whereby at a low power consumption required for its operation, a
uniform and stable delivery rate of the volatile substance may be provided
over nearly the complete life cycle of such a product. Further, the
apparatus ensures that the volatile substance, whether encapsulated in a
gel, gel-like, semi-solid, pasty carrier and/or in one of the porous
materials, i.e., porous polymer and/or ceramic, is safely and uniformly
delivered to an ambient environment such as the interior of the room or
other closed volume of space.
EXAMPLE
A base portion (10) similar as depicted on FIGS. 1-4 was manufactured. The
base portion (10) comprised a 1000 ohm resistor having a power rating of
1/4 watt, with the first end thereof connected via a first resistor lead
wire to a first plug and the other end thereof similarly connected via the
other lead wire. The ends of these wires were crimped to the ends of the
plugs. Subseqently the thus assembled resistor and plugs were inserted
into a suitably dimensioned die cavity and an amount of polypropylene was
injected therein. The thus formed base was ejected from the die cavity.
The top surface of the base was 13/8 inch by 13/8 inch. The thickness of
the top surface was 1/8th inch, and the bottom surface included a
centrally located post portion having a thickness of 1/8th inch, a width
of 1 inch and a length of 3/4 inch. The resistor and the base portions of
the two spade-type plugs were fully embedded in the base portion and/or
the post portion.
The base thus produced was then inserted into a wall outlet of the type
conventionally found in North America, which provided 120v alternating
current, 50/60 cycles operation for at least 5 minutes, or until steady
state heating of the base occurred. Temperature reading were taken using a
surface temperature probe at the central region, and in each of the the
regions of the four corners as is illustrated on FIG. 2. These results are
reported on Table I, below.
Subsequently, the base was removed from the outlet, cooled and a piece of
an aluminum foil tape was adhered to and covered substantially all of the
top surface of the base. Again, this base according to the invention was
then inserted into a wall outlet of the type conventionally found in North
America, which provided 120v alternating current, 50/60 cycles operation
for at least 5 minutes, or until steady state heating of the base
occurred. Temperature reading were taken using a temperature probe at the
central region, and in each of the the regions of the four corners as is
illustrated on FIG. 2. These results are reported on Table I, below.
TABLE I
______________________________________
temperature of
temperature of
base according to
region of base:
base invention
______________________________________
C 91.67.degree. C.
58.33.degree. C.
A1 61.67.degree. C.
57.22.degree. C.
A2 45.56.degree. C.
56.67.degree. C.
A3 52.22.degree. C.
57.78.degree. C.
A4 57.22.degree. C.
56.11.degree. C.
______________________________________
While the invention is susceptible of various modifications and alternative
forms, it is to be understood that specific embodiments thereof have been
shown by way of example in the drawings which are not intended to limit
the invention to the particular forms disclosed; on the contrary the
intention is to cover all modifications, equivalents and alternatives
falling within the scope and spirit of the invention as expressed in the
appended claims.
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